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Please help have a 2005 odyssey with VCM showing 2647 code it feels and sounds like its running on 3 cyl rough no power eng light and vsa on happens at low rpm/idle mainly when stopped at light restart and ok for bit stop at light and happens again not when cold only warm oil ok changed cleaned vtec and pressure switch first time it threw random misfire and 1-6 misfire codes only throwing 2647 now
Vehicle: 2005 honda odyssey 3.5L VCM

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P2647 your VTEC system is stuck on, check with the dealer you still may be able to qualify for the Campaign that was produced in 2011. here a partial TSB for this code condition

05-037

October 11, 2011

Applies To:
2005 Odyssey EX-L and Touring

- From VIN 5FNRL35...5B000001 thru 5FNRL35..5B057596
- From VIN 5FNRL35...5B400001 thru 5FNRL35..5B406550

Product Update: MIL Comes On With DTC P2647

(Supersedes 05-037, dated August 10, 2010, to revise the information marked with asterisks)

*REVISION SUMMARY
Under WARRANTY CLAIM INFORMATION, the flat rate was changed.*

BACKGROUND

The PCM software incorrectly interprets sensor inputs from the VTEC system. This may cause the MIL to come on with DTC P2647 (VTEC system stuck ON) the first time you start the engine after changing the engine oil and filter.

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